Military retiree with a Master fitness trainer certificate comparable to PT

I recently retired from the military 25 years active duty and seeking to expand my civilian knowledge and physical fitness exercise knowledge. I am familiar with training military personnel one on one, body fat assessments, exercise modifications, special population fitness, weight training, meal planning, healthy weight loss and competitive weight lifting. I was AAFAA certified years ago and recently obtained my ACE group fitness certification and indoor cycling instructor from Les Mills. I have no intention of working at a fitness facility as a personal trainer. If I plan to work with individuals teaching them about exercise and fitness in small groups or one on one, do I need a civilian personal training certification. I feel very knowledgeable and confident that I already know the information however don’t know if I need to obtain a civilian PT certificate. Thank you.